Jim Robertson wrote:
>
> At 22:52 5/01/99 EST, you wrote:
> >Hi all, 2 questions here.
> >1. I'm building a P16Pro serial PIC programmer designed by Dojan Dobaj. I
> have
> >all but 1 part avalible to me, which are the PNP BC557 transistors used for
> >switching the programming voltages. Is using this exact transistor
> critical to
> >the operation? Or can I use say a MPS2907 which can be bought at Radio Shack?

> You can use the 2907 but if memory serves correctly, you will need to
> rotate them
> 180 degrees as the emmiter and collector are transposed as compared to the
> BC547.
> This is assuming that the MPS2907 are the same pinout as the PN2907 parts.
> (I got caught on this myself)
> Note that this is from memory so please just be aware of the possibility
> and check
> it out before soldering.
> Jim

Ben Wirz did a pdf on this subject:
ftp://wirz.com/Simm_Stick/dt001.pdf
Uses a 2N4403 instead of a BC557 or BC558.
http://www.dontronics.com/dt001cha.html
also explains it.

>From Jim:
>Oh, yes,  P.S. If you were wondering, I'm 34 today and still as ugly as the
>day I was born.. :-)

I didn't know you at birth Jim, even though I have known your brother
for around 25 years now, but I can testify that your ugliness hasn't
noticeable increased in the last few years, so you may well be correct.
:-)

Happy Bithday.

Don McKenzie  mailto:don@dontronics.com http://www.dontronics.com

Don's Download Dungeon:   http://www.dontronics.com/download.html
Australian Electronics Ring http://www.dontronics.com/aering.html